Punctured Polyhedra - Ivars Peterson (MathTrek)
A tetrahedron has four triangular faces, four vertices, and six edges. When a vertex of one tetrahedron pierces the face of a second tetrahedron it forms a new, more complicated polyhedron: one triangular face has a triangular "hole" where the face was
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Research Institute of Symbolic Computation (RISC-Linz)
The Research Institute for Symbolic Computation, RISC, is an Austrian institute devoted to the field of symbolic computation. The site includes descriptions of various research areas, such as combinatorics, constraint solving, the theory of computation,
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Research Papers - The Geometry Center
Scientific papers written at the Geometry Center that use the unique aspects of hypertext to present information in a non-linear fashion. Many include movies or interactive pictures. A Tight Polyhedral Immersion of the Real Projective Plane with one Handle
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Vi Hart - Vi Hart
Blog, videos of math "doodling," instructions for slicing food mathematically, and more from the self-described recreational mathemusician who considers math a hobby, with "special interests in symmetry, polyhedra, and surreal complexity. This usually
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Voronoi Art - Scott Sona Snibbe
Using a retro-reflective floor to display the Voronoi diagram of people walking on it, exploring notions of personal space and individual-group relations. See also Scott's other projects.
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